In Detroit, one night in the late '50s, while talking to the late John Coltrane, he asked me several questions, which are as follows: Which two keys have 12 different tones? Which two keys have 11 different tones? Which two keys have ten different tones? Which two keys have nine different tones? Which two keys have eight different tones? Which two keys have seven different tones? Which two keys have six different tones? Which two keys have five different tones? Which two keys have four different tones? Which two keys have three different tones? Which two keys have two different tones? And which two keys have one different tone?

That night we found the answers.

-- Yusef Lateef

Steadfast a lamp burns sheltered from the wind;
Such is the likeness of the Yôgi’s mind,
Shut from sense-storms and burning bright to Heaven.

-- Bhagavad Gita VI:66-68

The light of the body is the eye: if therefore thine eye be single, thy whole body shall be full of light.